Device for removing mainsprings frofv



(No Model.)

D. SWITZER.

DEVICE FOR REMOVING MAINSPRINGS FROM GLOGKS.

Patented Jan. 8, 1884.

.N VIJWTOR I 32% WITNESSES UNITED STATES PATENT EEicE.

DAVID S\VITZER, OF MOUNT PLEASAXT, MICHIGAK DEVICE FOR REMOVINGMAINSPRINGS FROM CLGCKS.

SPECIFICATION forming part of Letters Patent No. 291,803, dated January8, 1884.

Application filed August 28,188.

To (tZZ whom it may cofwcrn:

Be itknown that 1, DAVID Swrrznn, a citizen of the United States,residing at Mount Pleasant, in the Stateof Michigan, have inventedcertain new and useful Improvements in Devices for Removing Mainspringsfrom Clock Mechanism, of which the followingisa specification, referencebeing had therein to the accompanying drawings.

This invention has relation to improvements in devices for removingmainsprings from clock-work without impairing the usefulness of any ofits parts or interfering with its mechanism; and it consists in theconstruction and novel arrangement of parts hereinafter set forth.

The invention has for its object to provide a cheap and simple meanswhereby mainsprings may be quickly removed from clock mechanism withoutnecessitating the operation of removing the frame and many of its parts.This object is accomplished by the devices shown and illustrated in theaccompanying drawings, in which- Figure l is a representation ofsufficient of the upper and lower plates of a clock to show a mainspringand my improvements applied. Fig. 2 is a view of the inainspring withthe key-arbor and post-sleeve attached, and the ring applied to thespring in a wound position. Fig. 3 is a view of the plates wit-h onepost and the removable securing-plate, and Fig. 4. is a view of thespring holding ring.

Referring to the drawings by letter, A in dicates the upper and B thelower plates, which are connected and held apartat one end by theordinary post, a, as shown. The lower plate, B, may be provided with aperforation, 1), into which is pivotally seated the lower end of thekey-arbor (I, which carries the mainspring. The upper plate, A, directlyabove the perforation in the lower plate, is provided with a notch oropening, 0, and at opposite sides of said opening are perforations d.

D represents the arbor-securing plate, which is perforated, as shown atc, to receive the upper end of the said arbor when seated in the notch eof the upper plate, and perforated at ff to register with thosein theplate A, to re- (Xo model.)

ceive screws or other suitable fastening devices. In some clock-work itis desirable to construct the plates of stout material and deeply seatthe arbors in their pivotal bearings. In such cases the lower plate,instead of being perforated, as shown, maybe notched and provided with akeeper or securing-plate similar to that of the upper plate withoutdeparting from the spirit of my invention.

Another important feature of my invention is the employment of a sleeve,to which one end of the mainspring is connected. This sleeveEis designedto hold the outer end of the spring, and, in connection with abolt orrod, F, support and hold the upper and lower plates apart by the ends ofthe sleeve engaging the inner side of the plates A and B, respectively,when stayed by the said bolt.

Instead of the keeper being perforated to receive the arbor, it may benotched to form apart of the bearing, and pivoted or hinged at one endto the plate, so that it may be swung around in removing and replacingthe spring, the opposite end being secured by means of asmall screw orother suitable fastening devices.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is

1. A inainspring having its outer end se cured to a sleeve adapted to beheld between I the upper and lower plates of a clock-mechanism frame bymeans of a bolt or rod, substantially as and for the purpose specified.

2. The combination, with the lower plate, B, provided with mcansto seatthe arbor carrying the mainspring, of the upper plate, A, provided withmeans to receive and hold the upper end of the said arbor, and thespring; having its outer end secured to the tube or sleeve, which isheld between the upper and lower plates by a bolt or rod passing throughits bore, substantially as specified.

In testimonywhereof I aitix my signature in presence of two witnesses.

DA'YID SWITZER. \Vitnesses:

l). E. L on, I. N. GULrcic.

